Do I deserve better?

Yet every time there's an argument I'm left crying. I'm the one left hurt. He never seems phased by anything. Never is sad. He's blocked my number because "I made it easy for him to do so". (His words). I feel like my emotions are being played with. The last time we actually broke up, I tried moving on and barely talked to him (I guess you can say I acted like I didn't care). And he came chasing after me. After weeks of begging to have me back, we got back together. Now he's doing the same stuff over again. When we aren't fighting, everything is perfect. But when there is a fight, he acts like he doesn't care. I'm almost 100% sure that if I didn't chase him every time, we would be done for good. 

As of now I blocked his number and him on Facebook after the last thing (in previous sentence) he said to me. I'm not sure he'll come chasing after me. What should I do? I can't stop crying. Why do I care so much but he doesn't?